Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment

Property, Plant and Equipment

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Abstract]

Property, plant and equipment at March 31, 2021 and December 31, 2020 consisted of the following:


	Estimated Useful Life (in Years)	March 31, 2021		December 31, 2020
Energy systems	1 - 15 years	$	3,378,327	$	3,526,514
Machinery and equipment	5 - 7 years	1,464,123		1,448,024
Furniture and fixtures	5 years	193,698		193,698
Computer software	3 - 5 years	192,865		192,865
Leasehold improvements	*	450,792		450,792
		5,679,805		5,811,893
Less - accumulated depreciation and amortization		(3,540,415)		(3,528,047)
		$	2,139,390	$	2,283,846

* Lesser of estimated useful life of asset or lease term

Depreciation and amortization expense on property and equipment for the three months ended March 31, 2021 and 2020 was $160,556 and $175,660, respectively.